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Magnetic and Mechanical Properties of a 6%V Permalloy as Magnetic Head Materials

1985; Japan Institute of Metals and Materials; Volume: 26; Issue: 8 Linguagem: Inglês

10.2320/matertrans1960.26.587

2432-4701

Yoshinobu Sato, Takeshi Takeyama,

Non-Destructive Testing Techniques

The suitability of 6%V Permalloy as magnetic head core materials for use in the digital tape-recording unit of an electronic computer has been investigated with respect to important requirements for the core materials such as effective permeability in a high frequency field, stress-sensitivity in magnetic permeability, wear-resistance and mechanical workability, in comparison with other conventional Permalloys, e.g., 4%Mo Permalloy and 4%Mo-5%Cu Permalloy. V Permalloy examined has a higher ac magnetic permeability in the high frequency range as well as better dc magnetic properties than the compared alloys, in particular at lower annealing temperature below 1073 K. The stress sensitivity of V Permalloy is very low at all annealing temperatures and exciting frequencies so that the value of permeability under stress remains very high. During the process of rubbing against a magnetic tape at a high speed, thin films are formed on the frictional surface of V Permalloy specimen, and V Permalloy is superior in the wear-resistance to the other Permalloys. V Permalloy has the same order of magnitude of mechanical hardness as the other conventional soft Permalloys and has good workability. From these results, it is thought that 6%V Permalloy is superior to the compared alloys for use as magnetic head material.